When it comes to feeling the heat from your boss and your job, you might be likely to name Monday as the most stressful day of all. But you'd be wrong. 

The real killer of the week is ... Thursdays, according to Whisper, the anonymous confession app. That's when people most often use Whisper to air their work frustrations.

The company analyzed 200,000 Whispers pertaining to negative sentiments toward bosses and found that the frequency of messages spiked on the penultimate day of the workweek.

One possible explanation? Sure, Mondays are hard, but if you're having a tough week by the time you get to Thursday, tensions are running very high. And then you have to come into work again the next day.

Whisper users tend to fall in the age range of 18 to 29 years old, according to anecdotal information from Whispers, says director of communications Aishwarya Iyer. So these messages are coming mostly from Millennials.

 inline image

Past surveys have aimed to elucidate which days of the week are most stressful for workers. Back in 2009, a British survey asserted that Tuesday at 11:45 a.m. was the time when backed-up work from Monday and stress from planning the rest of the week converge into a nasty moment of panic for workers. 

A Gallup poll came to a more pessimistic conclusion: Overall sentiment among workers was no worse during the middling days of the work week than classically maligned Monday. In other words, with the exception of Friday, every day is a stressful day.

Iyer says that Whisper's data differs from surveys in that it relies on sentiments expressed willingly in the moment by users. Surveys, on the other hand, ask people to recall past experiences.

Messages culled from the analysis of 200,000 Whispers submitted over two and a half years ranged from general frustration to exasperation.

"Life is so stressful! Why can't my two bosses get along?" read one.

"All day at work today my boss has periodically glared at me. All it does is stress me out. Why is she doing this??? WTF???" another user wrote.

Whisper selected items for analysis on the basis of overlap of keywords signifying stress, words like boss, manager, and supervisor. Thursdays saw 50 percent more of these types of Whispers than the low point, Sundays. From Friday to Saturday, frequency of the angst-ridden messages dropped 20 percent.

The analysis follows another recent work-related release from Whisper, revealing the worst things they had ever seen their bosses do.